Automatic stop-governor.



J. E. SNYDER.

AUTOMATIC STOP GOVERNOR.

APPLICATION FILED DEC.I8. 1909.

1,189,634. Patented July 4, I916.

3 SHEETS-SHEET I.

INVENTOR.

vub. ATTO EYINFACT.

J. E. SNYDER. AUTOMMIC STOP GOVERNOR.

APPLICATION FILED DEC. I8, 1909. 1,189

Patented July 4 JLE. SNYDER.

AUTOMATIC STOPGOVERNOR.

APPLICATION FH 'ED DEC. I8. 1909. 1,189,634. Patented July 4,1916.

3 SHEETS-SHEET 3.

IN VISA/TOR. B y L 41m A TT NEYIN FACT.

sTATEs JOHN E. SNYDER, or SWISSVALE, PENNSYLVANIA, ASSIGNOR, BY MEsNE Assre mnN'rs ro THE COLONIAL rRUsrr coMrANmTnUs'rnE; VANIA, A CORPORATION or PENNSYLVANIA.

on PITTSBURGH; PENNSYL- Au'roMarrc s'ror-eovEnNoa.

' To all whom it may concern:

Be itknown that I; JOHN EJSNYDER, a

citizen of the United States, and a resident of Swissvale, in the county of Allegheny and State of Pennsylvania, havemade a new and useful Invention in Automatic Stopovernors, of 'whichthe following. is a specification. r

This inventlon relates to governors and particularly to automatic stop or ,cutfl' governors.

"Elastic fluid turbines and all other types of fluid actuated engines are ordinarily provided. with speed governors, the functions of which are to automatically pr0por ''tion the supply of motivefluid tothe engine in accordance with the load demanded and to maintain the speed of the engine practically constant. It is also customary to provide; in addition to the speed 'gover .nors, auxiliary or automat1c stop governors.

The only function of these governors is to act, under emergency" conditions, and shut oif the supply of motive fluid whenthe engine has exceeded a certain predetermined speed. As these governors operate "only,

when the speed governor has faile'dto perform'its function and 'isincapable of'gov ii erning the speed of the engine, it is essential that they operate promptly and effec 'tively to shut off the supply of motive 'fiuid to the engine.

V An object of my invention is therefore,

to produce a simple and effective cut off governor, which will act promptly and positively in performing its function; This and other objects I attain in the drawings accompanying this application and forming a part thereof. In the drawings Ihave s I lstop governor. embodyingo my:iinvention. .Fig. 2'is an end elevation of the housing gitudinal section of a relay valve adapted "to cooperate with the automatic 'stop governor; Fig. 3 is a partial section anda partial plan view of the apparatus shown in Specification of Letters Patent.

shown in Fig. 1 in connection with'a lon- Patented u 1 4; 19161.

Applicati onfiled December 18, 1909. Serial No. 533,838.

Fig. 1; Fig. 4 is'an end view of a governor embody ng my invention and shown in connection with a trip lever; and Fig. l5'iS a section alongthe line C C of Fig. .2. c j

turbine shaft 7 i is inclosed within a housing 8 whichlis secured, in any suitable manner,

to the turbine casing and on which a relay valve 9 and a controlling device for the valve are mounted.- K y f The relay valve comprises a casing 10 .whlchis divided into two chambers 11 and 12, and in which a valve disk 13 operates to open and close communication between'the 1 Referring to the drawings, the end of a 1 chambers; The chamber 12 is adapted to communicate, through suitable piping or passages, with the pressure chamber of a fluid actuated cutoff valve, and the cham- -ber 11 is adapted to communicate withthe atmosphere through a port 11 (Figs. 1

and 2).

The valve disk 13 is held closed against the fluid pressure in chamber 12 by a, so-called,

12 and consequentlyin the pressure chamber of the cut ofl. valve withwhich it communiturbine. The trip lever l8 is arranged to release the replacing lever 14 and to thereby release the valve disk- 13, when an excessive speed of the turbine causes the automatic stop governor to engage thefinger'21. d

replacing lever 14 which operates through the adjustingbolt 15, a'helical spring-16 and avalve stem 17; While the valve'is closed fluid pressure is maintainedin the chamber 'catesjand-the cutoff valveis consequently held open and caused to deliver motive fluid to the turbine. The lever 14 is heldin place against the bolt 15 by a trip lever 18 and the lever 18is mounted on apin 19 whichex tends through the end of the housing8 and is provided atitsinner end'with a finger 21 adapted to be engaged by the automatic stop governor during excessive speeds of the areexhausted into the :atmospherea'nd the d 7 cut off valve is caused to close andto cut-off I the flow of motive fluid tojthe turbine.

The governor consists of a cylindrical casing' 22 which is secured to the end; offthe g turbine shaft .7, and a pin 23, which is mounted in the casing and iscapable of mov ing diametrically of the casing under the influence of centrifugal force. The casing is provided on one end face with a tapped lug 21, by means of which it is screwed onto the end of the shaft 7. A screw 25 extends through the casing 22 and engages the end of the shaft for the purpose of locking the casing in place on the shaft. This screw may, if desired, project into recesses provided at the end of the shaft.

The pin 23 is located in a cylindrical bore 26 which extends diametrically through the casing and which is counter-bored at one end to a larger diameter, for the purpose of receiving the pin. The pin is provided with a head 27 of increased diameter which is located within the counterbored portion of the bore 26. The head 27 is secured in place by means of a balancing plug 28 provided with a bush 28 and located in the counterbore and secured in place by means of a pin 29 which extends transversely through the plug and is riveted over at each end of the casing.

Projecting from the head 27 is a tail piece or pin which is guided in the bush 28 The space between the plug 28 and the end of the counterbore permits of suilicient play of the head 27 to allow the escape of oil or other matter through the openings 28 in the plug 28.

The smaller end of the bore 26 is tapped to receive a screw plug 30 through which the end of the pin 23 is adapted to project. The plug 30 besides acting as a guide for the pin 23, forms an adjustable abutment for a helical spring 31 which surrounds the pin 23 and is located between it and the head portion 27 of the pin. The tension of the spring 31 is adjusted by screwing the plug 30 into or out of the bore 26. Longitudinally extending slots 32 are cut across the threaded face of the plug 30 and are adapted to be engaged by a tongue 33 formed on a key 3%. The key 34 projects into an aperture 35 provided in one end of the casing 22 and is held in place, in the aperture, by means of a spring 36 which is secured to the casing. In adjusting the tension of the spring the plug 30 is turned until the tongue 33 of the key 3% engages one of the slots 32 and it is then held securely in place.

The pin23 is so constructed that, when in place in the casing, its center of gravity falls ecceutrically of the shaft 6 and in line with the axis of the bore but nearer the open end of the bore. Under such conditions, the centrifugal force, due to the rotation of the pin, tends to move the pin longitudinally of itself or diametrically of the casing, in opposition to the pressure of the spring 31.

When the centrifugal force is sufficient to overcome the tension of the spring, the pin moves, during its rotation, to occupy difl'er ent positions along the bore 26 for the differrotative speed of the shaft exceeds the determined maximum speed, the centrifugal force exerted upon the weighted end of the pm will cause an instantaneous movement thereof to effect the automatic actuation of the trip. Thus it will be seen that the trip will be highly sensitive and reliable for any speed previously determined. At some predetermined speed the centrifugal force is sufiicient to cause the end of the pin to project beyond the peripheral face of the casing 22 and to engage the trip finger 21.

The arrangement is such that when the finger 21 is engaged by the pin 23 it, turning about its pivotal point, turns the pin .19, and, by turning the lever 18, releases the lever 1d and thereby releases the valve disk 13.

The valve disk 13 when released is actuated by the fluid pressure in the chamber 12 to open communication between the chamber 12 and the chamber 11 and to discharge the fluid pressure from the pressure chamber of the fluid actuated cut off valve, and to thereby cause the cut off valve to close and shut off the supply of motive fluid to the turbine. The arrangement of the tripping device is such that it must be manually reset before motive fluid is again supplied to the engine.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other means.

IVhat I claim is:

l. The combination of a rotating shaft, a casing secured to the end of the shaft and rotatable with the shaft, and having a bore which extends diametrically with relation to the shaft, a weight or pin located within the bore of the casing and extending diametrically across the end of the shaft, a coiled spring located within the casing and surrounding the pin, a screw plug screwed into the end of the casing and through which the pin projects and forming an adjustable abutment for the spring, and means for locking said plug against rotation relatively to said casing.

2. A revolving member having a recess extendmg at right angles to its axis of rotation, in combination with a pin, located subscribed I ny name t'his 14th day of Decem- Within and movable along said recess, an ber, 1909.

opposin spring locatedwithin said recess ,7 and engaging said pin, and a holder for ssaid i 1 a YDE spring screwed into the end of said recess Witnesses;

and iiorminga guide for said pin. I i =0. WrM Gims,

In 'testim'cny whereof, I have hereunto H5MCCONNELL:

Goplciotthh patut may be ebtained to r flvc centl each, bynddreuing the comm-mm at Patents, I

\ Wellington, 1 0." 

